To dilute a solute in a solution, it is necessary to add a proper solvent for the reaction to occur, and adding more solvent will cause the solution to dilute even more, therefore the best answer will be letter B
The number of moles of gas in the sample of chlorine gas is calculated by use of ideal gas equation that is PV=nRT n=number of moles R= gas constant ( 62.36367 l.torr/k.mol) P=pressure V=volume from ideal gas equation n= PV/RT n= (328 x5.0)/ ( 62.36367 x310)= 0.085 moles